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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
The testing laboratory is GLP compliant and the test was carried out according to the principles of GLP. An internal standard operating procedure was followed for the direct scanning calorimetry tests.
Principles of method if other than guideline:
Date 02/10/2017
SOP Reference CTL SOP 320
Test System DSC System 1
Test Filename DSC4028001957A
Crucible Type Gold-lined steel (high pressure, sealed)
Sample Preparation Tested as received
Start Temperature -40°C
Trip Temperature 400°C
Ramp Rate 4 K.min-1
Test Atmosphere Air
Sample Mass 4.7 mg
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Hop extract - CO2 extract of Humulus lupulus variety 'Cascade'. Batch number 160025. Principal components: alpha acids: 35.06% w/w; beta acids: 38.47% w/w; essential oils: 8.92% v/w
Key result
Remarks on result:
not determinable
Remarks:
No firm melting point noted on DSC, as expected for a plant-derived UVCB material

Notes from the test report: "The sample was observed to undergo an exothermic event from 60.3°C which had a heat of decomposition of -24.7 J.g-1. A second exothermic event was then observed to commence from 138.0°C which had a heat of decomposition of -157.7 J.g-1. No further significant energetic events were noted up to 400°C."

The DSC plot is attached - see "Illustration (picture/graph)"

Conclusions:
Melting point was not distinguishable, as discussed in detail in "Overall Remarks".

Description of key information

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
60 °C

Additional information

Substance becomes fluid above 60oC. Figure used for CSR. No firm melting point discernible.

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